ART. o GENERIC REVISIOX OF THE FOSSORIAL WASPS— PARKER 125 



apiru/la-e on the color and extent of the maculations, and it frequently 

 happens that specimens are taken that can not with certainty be 

 referred to either species by the use of any keys so far deviled. 

 Likewise many males are found that seem to be intermediate be- 

 tween this species and the males of svtnilams Fox and thus present the 

 t^ame difficulties in identification. Consequently no keys, even the 

 one I have prepared herewith, can be depended upon absolutely in 

 making identifications among these closely related species. 



SPECIMENS KXAMIN'ED 



Alberta: Medicine Hat (August 20, 1916, Sladen). 



Arizona: Oak Creek Canyon (F. H. Snow). 



BRmSH Columbia: Vancouver (Augu-st 9, 1916, Livingston^. 



Colorado: Boulder (September 13, 1907, S. A. Rohwer) ; Denver (.Tune 1.3, 



1902 >. 

 Idaho: Springfield (July 30, 1906, S. A. Snyder). 

 Loui!^iana: East Point (September 5, 1907, F. C. Bishopp). 

 Mexico: Guadalajara (June 19, 1903, McCIendon). 

 Ne\'ada: Reno (August 28, 1889, F. H. Hillman). 

 New Mexico: Fort Wingate (July 15, 1909, John Woodgate) ; High Rolls (June 



11, 1902). 

 Texas: Midland (June 16. 1909, F. C. Bishopp); Rosser (August 23, 1905, 



F. C. Bishopp) ; Victoria (September 11, W. A. Hooper). 

 AVashingtox: Friday Harbor (June 19-26, 1909); Olga (.July 15-31, 1909); 



Seattle. 



* BEMBIX SIMILANS Fox 



Figure 28 



Bemli/ex simUans Fox, Proc. Acad. Nat. Sci. Phila., 1895, p. 358. 

 Bembix simUatis Parker Proc. U. S. Nat. Mus.. vol. 52, 1917, p. 103. 



In this species both males and females have yellow maculations, in 

 this respect resembling ca7neroni. According to Fox's description 

 of this species, the fifth segment of the flagellum is " dentate be- 

 neath." On none of the specimens that I have referred to this 

 species do I find this to be true. B. cmneroni alone of this group of 

 closely related species has the fifth segment of the flagellum spinose 

 beneath. The maculations on the sides of the thorax and propodeum 

 are more extensive than on any other species of this closely related 

 group. The specimens on which Fox based his description of the 

 species were taken at Las Cruces, N. Mex. 



SPECIMENS EXAMINED 



Florjda : Jacksonville (April, L. O. Howard). 



Kansas. 



Mexico: San Jose de Guiiymas (April 10, L. O. Howard). 



New Mbisko: Mesilla Park (C. N. Ainslie) ; Las CiTices (August 30, Townsend). 



